The CEO of a large financial institution claims that, on average, their clients invest more than R150 000 per year in a particular portfolio. Test this claim at the 10% significance level if it was found that a sample of 25 clients invested an average of R145 000 in the portfolio over the last year, with a standard deviation of R15 000.

Q: A state university annual report showed that its retention rate was at 24% and university…

A: Null and alternative hypothesisNull Hypothesis:A null hypothesis is a statement regarding the…

Q: According to a University Center for Logistics Management, 9% of all merchandise sold in the United…

A: Let X be the number of items returned.Given, X=10 and n=90Null hypothesis:Alternative hypothesis:

Q: Miranda, a quality assurance inspector at a frozen treat factory, checks for product quality using a…

A: Given that,n = 11N = 41

Q: Last year employees of a city's health department donated an average of $ 15 pesos to the volunteer…

A: Given claim: The average contribution this year is greater than 15 pesos. Null Hypothesis: H0: The…

Q: A newsletter publisher believes that 72% of their readers own a Rolls Royce. A testing firm believes…

A: From the provided information, A newsletter publisher believes that 72% of their readers own a Rolls…

Q: Interpret the following statement regarding the statistical findings of a research study.  “61% (n =…

A: Introduction: The outcome of a study involving low-carbohydrate and low-fat diets is given.

Q: In a study on coronary artery disease, the time a patient can spend on a treadmill is measured while…

A: We want to find the null hypothesis and alternate hypothesis

Q: Determine whether the following results appear to have statistical significance, and also determine…

A: Statistical significance: In the study, when the result obtained is very unlikely to occur just by…

Q: Suppose we identify 50 women 50 to 54 years of age who have both a mother and a sister with a…

A: From the provided information, The hypotheses can be constructed as: H0: p = 0.04 H1: p > 0.04…

Q: In a study of the accuracy of fast food drive-through orders, McDonald’s had33 orders that were not…

A: (A)Here, the claim of the test is the proportion of inaccurate orders isequal to 10%. This is…

Q: As a result of complaints from customers about delivery times, the manager at a pizza delivery…

A: Given information- We have given that the average delivery time is 30 minutes. And the manager wants…

Q: According to a University Center for Logistics Management, 4% of all merchandise sold in the United…

A: The provided information are:

Q: . Write null and alternative hypotheses for p.

A: here given , Suppose the present success rate in the treatment of a particular psychiatric disorder…

Q: According to a University Center for Logistics Management, 10% of all merchandise sold in the United…

A: Given the hypothesis,H0:p=0.01Ha:p>0.01A Seattle department store sampled 90 items sold in…

Q: Use the figure to the right, which shows the percentages of adults from several countries who favor…

A:

Q: Women athletes at a certain university have a long-term graduation rate of 67%. Over the past…

A: H0 : p =0.67 H1 : p <0.67 Population proportion = p₀ = 0.67 Sample number of events = x =23…

Q: State the null and the alternative hypotheses

A: According to the given information in this question we need to identify the null hypothesis and…

Q: A financial analyst is studying how they can reduce credit card debt for their clients. It is known…

A: In hypothesis testing, 1. A null hypothesis is always constructed in a manner which says that there…

Q: Select the most appropriate response. Five years ago, a survey found that the proportion of city…

A: Solution:  The null and alternative hypotheses are:

Q: A December 2017 Gallup Poll reported that 43% of Americans use the internet for an hour or more each…

A: Given that  Sample size n =60 Favorable cases x =36 Sample proportion p^=x/n  =36/60 =0.6

Q: Proctor & Gamble claims that at least half the bars of Ivory soap they produce are 99.44% pure (or…

A: x = 46 n = 101

Q: At its peak after the 2007–2008​recession, credit card delinquency rates in a certain region reached…

A:

Q: Perform a hypothesis test at a 5% level of significance to see if the proportion of white…

A: Given information: Given that the investigator is specially to test whether the proportion of white…

Q: A researcher wants to know whether athletic men are more flexible than nonathletic men. For this…

A: The given sample size for athletic men is 50, sample mean is 4.3, sample standard deviation is 2.1,…

Q: It is recommended that adults get 8 hours of sleep each night. A researcher hypothesized college…

A: We want to find the null hypothesis

Q: A financial analyst is studying how they can reduce credit card debt for their clients. It is known…

A:

Q: Students in a high school statistics class are investigating the proportion of times a Hershey's…

A: We have to find correct conclusion from available options.

Q: According to a 2015 article, 37% of Americans aged 25 years or older have been arrested. An Orange…

A: Given that sample size n = 120 Number of persons who have been arrested, X = 48 Level of…

Q: 53% of students entering four-year colleges receive a degree within six years. Is this percent…

A: From the given information we conduct hypothesis test for our claim.

Q: Proctor & Gamble claims that at least half the bars of Ivory soap they produce are 99.44% pure (or…

A: Here we use z-test of a proportion. Proctor & Gamble claims that at least half the bars of Ivory…

Q: A stock analyst wondered whether the mean rate of return of financial, energy, and utility stocks…

A: Given the mean rate of return of financial, energy and utility stocks as   Financial  Energy…

Q: Round to the fourth as needed Requirements (part 1):       Requirements (part 2):       H0H0:…

A: Here one sample proportion test( tow tail z test of proportion )

Q: Write the null and alternative hypotheses using proper notation? b. What is the value of the test…

A: Given that Sample size n = 500 Sample proportion of market share = 0.125 Level of significance =…

Q: Country Financial, a financial services company, uses surveys of adults age 18 and older to…

A:

Q: A researcher wants to know if athletic women are more flexible than non-athletic women. For this…

A: From the provided information,

Q: A drug considered unsafe if more than 5% of the patients develop serious side effects. In order to…

A: Given Hypothesis- Null Hypothesis, H0: π ≤ 0.05 Alternate Hypothesis, Ha: π > 0.05 We know that-…

Q: Gaynor Advertising conducted a survey to determine individual’s main source of news as well as their…

A: Given, the survey results were conducted among 2500 individuals to determine the individual’s main…

2-Proportion Test

In a 2-proportion test, two separate proportions are measured at the same time, and their similarity is evaluated. It is also known as a 2-proportion z-test, and a comparison of two different proportions is done in this method.